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Eur J Cancer. 2009 Dec;45(18):3189-97. doi: 10.1016/j.ejca.2009.09.004. Epub 2009 Sep 28.

Circulating melanoma cells and distant metastasis-free survival in stage III melanoma patients with or without adjuvant interferon treatment (EORTC 18991 side study).

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  • 1Charité - Campus Benjamin Franklin, Berlin, Germany.

Abstract

AIM:

To evaluate the prognostic and predictive importance of detection of melanoma cells in peripheral blood using reverse transcriptase polymerase chain reaction (RT-PCR) in stage III cutaneous melanoma patients after sentinel or regional lymph node dissection.

PATIENTS AND METHODS:

Serial testing for tyrosinase and Mart-1/Melan-A transcripts in peripheral blood was performed every 6 months over a maximum period of 60 months in a subset of patients enrolled in EORTC 18991 phase 3 trial, comparing pegylated interferon-alpha-2b with observation. Univariate and multivariate analyses were performed to estimate the role of RT-PCR as prognostic and predictive factor for distant metastasis-free survival (DMFS).

RESULTS:

Among 299 patients who underwent RT-PCR analyses, 109 (36.5%) had at least one positive sample, either at time of randomisation (N=17) or subsequently (N=92). The cumulative rate of positive results was similar in the two treatment groups, as the DMFS from first RT-PCR positivity. RT-PCR result, positive versus negative, at a given time point, had no prognostic impact on subsequent DMFS. Cox time-dependent analysis indicated a significantly higher risk of developing distant metastasis in patients with a positive sample as compared to those with a negative one: hazard ratio (HR) of 2.23 (95% confidence interval (CI), 1.40-3.55; p<.001). These results were comparable in the 2 treatment groups, indicating that RT-PCR assessment was not predictive for treatment outcome.

CONCLUSION:

Detection of circulating tumour cells by RT-PCR for tyrosinase and Mart-1/Melan-A was a time-dependent moderate prognostic factor for subsequent development of distant metastasis in stage III melanoma patients.

PMID:
19793643
DOI:
10.1016/j.ejca.2009.09.004
[PubMed - indexed for MEDLINE]
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